Herderite

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Physical & Optical Properties

Mohs Hardness 5.0 – 5.5
Specific Gravity 2.9 – 3.02
Refractive Index 1.587 – 1.642
Crystal System Monoclinic
Luster Vitreous
Cleavage Indistinct
Fracture Sub-Conchoidal
Color various
Birefringence 0.028

Mohs Hardness

1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Orthoclase 7 Quartz 8 Topaz 9 Corundum 10 Diamond Herderite
Mohs hardness of Herderite shown against the ten reference minerals, from talc (1) to diamond (10).
Mohs Reference mineral Herderite
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Crystal System

β a b c Monoclinic a ≠ b ≠ c, α = γ = 90°, β ≠ 90°

Value & Market

Price Tier Budget (< $50/ct)

About Herderite

ヘルデライトは、カルシウムベリリウム燐酸塩鉱物(CaBePO₄F)で、無色から淡黄色・緑色・ラベンダー色を示す稀少な宝石です。透明な結晶はファセットカットされ宝石として使用されます。ブラジル・メイン州が主要産地で、宝石コレクターに人気の高い稀少石です。

Science FYI Family

Frequently Asked Questions

What is Herderite?
ヘルデライトは、カルシウムベリリウム燐酸塩鉱物(CaBePO₄F)で、無色から淡黄色・緑色・ラベンダー色を示す稀少な宝石です。透明な結晶はファセットカットされ宝石として使用されます。ブラジル・メイン州が主要産地で、宝石コレクターに人気の高い稀少石です。
What is the hardness of Herderite?
Herderite has a Mohs hardness of 5.0 to 5.5, making it moderate for use in jewelry.
What color is Herderite?
Herderite is primarily Various.
How much does Herderite cost?
Herderite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Herderite?
Herderite belongs to the Monoclinic crystal system.

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